Where it must be matched with a servo planetary reducer?

- Mar 03, 2021-

In the application of modern industrial equipment in high-precision applications, with the development of servo motor technology, from high torque density to high power density, the increase in speed is higher than 3000 rpm. Due to the increase in speed, the power density of servo motor is greatly increased. This means that whether the servo motor needs to be equipped with a reducer is mainly determined from the application requirements and cost considerations. For example, the following applications must be equipped with a servo planetary reducer.

  1. heavy load high precision

   This is required when the load must be moved and precise positioning is required. Generally, automation equipment such as aviation, satellite, medical, military technology, wafer equipment, robots and so on. Their common feature is that the torque required to move the load often far exceeds the torque capacity of the servo motor itself. This problem can be effectively solved by increasing the output torque of the servo motor through a reducer.

  2. increase torque

The way to increase the output torque may be to directly increase the output torque of the servo motor, but this way not only must use an expensive and high-power servo motor, the motor must have a stronger structure, and the increase in torque is proportional to the control current. Increase, at this time using a relatively large drive, power electronic components and related electromechanical equipment specifications increase, and will greatly increase the cost of the control system.

   3. Improve performance

   It is understood that improper matching of load inertia is one of the biggest reasons for the instability of servo control. For large load inertia, the inverse square of the reduction ratio can be used to adjust the best equivalent load inertia to obtain the best control response. So from this point of view, planetary gearboxes are the best match for the control response of servo applications.

  4. reduce equipment costs

From the cost point of view, assuming that a 0.4KW AC servo motor is used with a driver, it will cost one unit of equipment cost, and a 5KW AC servo motor with a servo driver must cost 15 units of cost. However, if a 0.4KW servo motor and driver are used, a set of deceleration is required. The machine can achieve the aforementioned 15 unit costs to complete, saving more than 50% in operating costs.